JP2008021072A - Photographic system, photographic device and collation device using the same, and photographic method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photographic system for preparing a registered image group of a collation device by photographing a plurality of images with different photographic conditions in natural states without applying any feeling of pressure to a person as an object by simple device configuration. <P>SOLUTION: The photographic system is provided with a first light source device 2 for irradiating an object 30 with light having first spectral distribution, a second light source device 3 for irradiating the object 30 with light having second spectral distribution different from the first spectral distribution and a photographic device 1 having a wavelength selection part for transmitting the light of selected wavelength distribution and acquiring a plurality of images having respectively different shadows in the object 30 by photographing the object 30 which is irradiated by the first light source device 2 and the second light source device 3 twice or more by changing the wavelength distribution to be selected by the wavelength selection part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a collation device that performs personal authentication of a subject mainly using a face image of the subject. More specifically, the present invention relates to a photographing system for photographing a registered image group of the collation device, a photographing device, and a collation device using the same. It relates to the shooting method.

  In recent years, as a method of personal authentication at the time of access in devices requiring high security, such as entry / exit management devices and information devices storing important information such as personal information, human body fingerprints, irises, fundus blood vessels, facial Various authentication methods using information unique to the person to be authenticated, such as features, blood vessel patterns of hands and arms, so-called biometric information, have been put into practical use.

  Among them, for ease of use and high reliability, face images registered in advance using facial feature points (hereinafter referred to as registered images) and input faces The person corresponding to the input image is a person who has been registered in advance when the image (hereinafter, such an image is referred to as an input image) is compared and collated and it is determined that the features match each other. And so-called face matching technology have been widely put into practical use.

  In such face matching technology, the shadows that occur in the image may differ depending on the shooting conditions such as the arrangement of the light source when the registered image is shot and when the input image is shot. The difference between the shadow of the registered image and the shadow of the input image has hindered correct collation when comparing and collating the images.

  In order to solve such a problem, for example, a technique has been proposed in which the difference in shading is removed in advance by capturing an input image under the same conditions as those for capturing a registered image. (For example, refer to Patent Document 1).

In addition, a plurality of registered images having different shadows are captured in advance under various shooting conditions, and the plurality of registered images are stored in the storage unit as a registered image group, regardless of the shooting conditions of the input image. A technique that can correctly perform comparison and collation has been proposed (see, for example, Patent Document 2).
JP 2001-338296 A JP 2001-283216 A

  However, in the technique as described above, in order to capture a registered image group having various shadows, a plurality of light sources in an array shape are used, or a plurality of light sources are provided on a tower-like frame. The device configuration becomes complicated, such as shooting a group of registered images with different shadows by turning on multiple light sources sequentially, or shooting a group of registered images with different shadows while moving the light source using a manipulator. There has been a need for an apparatus configuration that can increase the height and that is highly likely to cause a subject to feel very tight.

  The present invention has been made in view of such problems, and has a simple apparatus configuration and can capture an image group such as a registered image group naturally without giving a sense of pressure to a subject. An object is to provide a photographing apparatus, a collation apparatus using the photographing apparatus, and a photographing method.

  The imaging system of the present invention includes a first light source device that irradiates a subject with a light beam having a first spectral distribution, and a second light source that irradiates the subject with a light beam having a second spectral distribution different from the first spectral distribution. And a wavelength selection unit that transmits a light beam having a selected wavelength distribution, and the wavelength selection unit selects a subject irradiated by the first light source device and the second light source device. And a photographing device for acquiring a plurality of images with different shadows from each other by photographing a plurality of images with different images.

  According to such a configuration, the registered image group can be naturally created without giving a sense of pressure to the subject with a simple device configuration using two light source devices having different spectral distributions and an imaging device having wavelength selectivity. A photographing system capable of photographing can be provided.

  The wavelength selection unit may have a plurality of optical filters.

  According to such a configuration, a configuration with excellent versatility and practicality can be realized.

  Further, the wavelength selection unit may include a switching control unit that performs switching control of a plurality of optical filters.

  According to such a configuration, a simple and highly practical configuration of switching a plurality of optical filters can be realized.

  Further, the second light source device may be configured to irradiate the subject from a direction different from the direction in which the first light source device irradiates the subject.

  According to such a configuration, since the two light sources irradiate from different directions, it is possible to obtain images having a plurality of different shadow contrasts.

  Furthermore, the imaging device may have a configuration including an imaging control unit that controls imaging timing so as to acquire an image in accordance with selection of a wavelength distribution by the wavelength selection unit.

  According to such a configuration, it is further possible to automatically capture images with different shadows of the subject.

  Furthermore, the imaging control unit may be configured to control the imaging timing of the imaging device based on the control signal of the switching control unit.

  According to such a configuration, it is possible to more reliably perform imaging that matches the wavelength change of the wavelength selection unit.

  In addition, the photographing apparatus may have a storage unit that stores a photographed image.

  According to such a configuration, it is possible to use the captured images of the subjects having different shadows for different purposes.

  Next, an imaging apparatus according to the present invention includes a first light source device that includes a wavelength selection unit that transmits a light beam having a selected wavelength distribution, irradiates a subject with a light beam having a first spectral distribution, By photographing a plurality of subjects in a state irradiated with a second light source device that irradiates the subject with a light beam having a second spectral distribution different from the spectral distribution, with different wavelength distributions selected by the wavelength selection unit In addition, the present invention is characterized in that it includes a photographing unit that acquires a plurality of images of the subject with different shadows.

  According to such a configuration, it is possible to provide an imaging device that can capture a registered image group naturally without giving a sense of pressure to a subject with a simple device configuration.

  Further, the photographing apparatus further includes an image selection unit that selects an image according to a predetermined reference from a plurality of images with different shadows of the photographed subject, and a storage unit that stores the selected image. There may be.

  According to such a configuration, for example, the number of images for the matching process in face recognition can be reduced, the efficiency of the matching process can be improved, and an image suitable for the matching process can be selected. Improvements can be made.

  In addition, the imaging device includes a color imaging device having a color filter corresponding to a plurality of types of colors as a wavelength selection unit and a plurality of light receiving elements, and the imaging unit performs imaging for each color type of the color filter. It is good also as such a structure.

  According to such a configuration, since a color imaging device including a color filter can be used, it is possible to easily create an image group having different illumination conditions necessary for maintaining the accuracy of face recognition.

  Next, the collation apparatus according to the present invention includes the photographing apparatus according to the present invention, a storage unit that stores, as a registered image group, a plurality of images of a subject photographed by the photographing apparatus, and an image to be collated And a collation unit that compares and collates the image to be collated input from the input unit and the registered image group stored in the storage unit.

  According to such a configuration, it is possible to realize a collation device using a photographing device that can photograph a registered image group naturally without giving a sense of pressure to the subject with a simple device configuration.

  Further, the collation device of the present invention receives the image capturing device of the present invention, a storage unit that stores a plurality of images of a subject with different shadows as a registered image group, and an image to be collated that is captured by the image capturing device. And a collation unit that compares and collates an image to be collated input from the input unit and a registered image group stored in the storage unit.

  According to such a configuration, an imaging device capable of capturing an input image group naturally with a simple device configuration without giving a sense of pressure or discomfort to the subject and further not being noticed by the subject. A collation device using can be realized.

  Next, the imaging method of the present invention irradiates a subject with a light source having a first spectral distribution and a light source having a second spectral distribution different from the first spectral distribution. A method for photographing a subject using a photographing system including a second light source device and a photographing device, wherein the photographing device irradiates the subject irradiated by the first light source device and the second light source device. The method includes a step of photographing a plurality of images with different shadows of a subject by photographing a plurality of images with different wavelength distributions.

  According to such a method, a subject irradiated with two light source devices having different spectral distributions is imaged with a photographing device having wavelength selectivity without giving a feeling of pressure to the subject, It is possible to provide a photographing method capable of photographing a registered image group naturally.

  As described above, according to the present invention, an imaging system, an imaging apparatus, and an imaging system that can capture an image group such as a registered image group naturally without giving a sense of pressure to a subject with a simple apparatus configuration. A collation apparatus using the camera and an imaging method can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, the imaging system 10 according to the first embodiment of the present invention will be described. 1 and 2 are diagrams showing a schematic configuration of a photographing system 10 according to the first embodiment of the present invention. FIG. 1 is a plan view of the photographing system 10 as viewed from above. FIG. It is the side view which looked at the imaging system 10 from the side.

  As shown in FIGS. 1 and 2, the photographing system 10 is viewed from the left direction toward the subject 30 when viewed from the photographing device 1 and the photographing device 1 that are arranged so as to face the subject 30 that is a person. The first light source device 2 that irradiates the face of the subject 30 and the second light source device 3 that irradiates the face of the subject 30 from the right direction toward the subject 30 when viewed from the photographing device 1.

  Actually, a photographing system 10 having a photographing device 1, a first light source device 2, and a second light source device 3 is installed in a predetermined place (a room with some degree of darkness is desirable). When the image is taken, the subject 30 can use the photographing system 10 according to the first embodiment of the present invention by being located at a place as shown in FIGS. 1 and 2.

  FIG. 3 is a diagram illustrating an example of a registered image group 50 in the first embodiment of the present invention that is captured using the imaging system 10.

  The photographing system 10 is a photographing system suitable for photographing a face image having various shadows of the subject 30 as shown in FIG. The registered image group 50 having such various shades is suitable for use in collation in the face collation method. In the example illustrated in FIG. 3, as the registered image group 50, the registered image 53 in which the subject 30 is irradiated with light from the front, and the light is irradiated slightly toward the subject 30 from the registered image 53 toward the subject 30. The registered image 52, the registered image 51 irradiated with light rays from the right direction further toward the subject 30 than the registered image 52, and the registered image 53 irradiated with light rays from the front, slightly directed toward the subject 30 from the left direction. The registration image 54 that has been irradiated and the registration image 55 that has been irradiated with light rays from the left toward the subject 30 further than the registration image 54 are provided.

  As described above, the photographing system 10 has a simple configuration of using the photographing device 1, the first light source device 2, and the second light source device 3, and has various shades different from each other as shown in FIG. The image group 50 can be taken. Hereinafter, the configuration of the imaging system 10 will be described in more detail.

First, as shown in FIG. 1, the horizontal angle formed by the irradiation direction of the subject 30 by the second light source device 3 with respect to the optical axis connecting the photographing device 1 and the subject 30 is defined as an irradiation angle θ1. When the horizontal angle at which one light source device 2 irradiates the subject 30 is defined as an irradiation angle θ2, in the photographing system 10,
θ1 = θ2
The imaging device 1, the first light source device 2, and the second light source device 3 are arranged so as to satisfy the above.

  Further, as shown in FIG. 2, a vertical angle formed by an irradiation direction in which the light beam of the first light source device 2 irradiates the subject 30 with respect to the optical axis direction formed by the photographing device 1 and the subject 30, and The photographing device 1, the first light source device 2, and the second light source device 3 are arranged so that the vertical angles at which the light rays of the second light source device 3 irradiate the subject 30 are substantially equal.

  Note that these arrangements are determined by detecting the height of the face of the subject 30 and changing the height, orientation, and the like of the imaging device 1, the first light source device 2, and the second light source device 3. Alternatively, the arrangement of the photographing device 1, the first light source device 2, and the second light source device 3 is determined in advance, and the subject 30 is determined by adjusting its position or being guided. It may be configured.

  Here, the spectral distribution characteristics of the light sources of the first light source device 2 and the second light source device 3 will be described. The present invention is characterized in that images having various shadows for face matching are acquired using the spectral distribution of such a light source.

  FIG. 4 is a diagram illustrating spectral distribution characteristics of the spectral distributions of the first light source device 2 and the second light source device 3 of the imaging system 10 according to the first embodiment of the present invention.

  In FIG. 4, the horizontal axis indicates the wavelength, and the vertical axis indicates the light intensity in the wavelength region. In FIG. 4, each wavelength region is indicated by using three primary colors of light, that is, blue indicated by B, green indicated by G, and red indicated by R at the wavelength on the horizontal axis. In the following, description will be made while appropriately indicating the wavelength region using these colors. In the present embodiment, the spectral distribution of the first light source device 2 is indicated by a solid line, and the spectral distribution of the second light source device 3 is indicated by a broken line.

  As shown in FIG. 4, the spectral distribution of the first light source device 2 has a wavelength characteristic that is low in the blue region, gradually increases in the green region, and highest in the red region. On the contrary, the spectral distribution of the second light source device 3 has a wavelength characteristic that is highest in the blue region, gradually lower in the green region, and lowest in the red region.

  The first light source device 2 and the second light source device 3 according to the first embodiment of the present invention have different spectral distributions and spectral distributions whose intensity changes according to the wavelength. If it is a light source, various light source devices can be used. In addition, the above-described spectral distribution characteristic can be realized simply by combining an optical filter having the above-described spectral distribution with a known light source device. In the spectral distribution characteristics, more specifically, at least one light source among the plurality of light sources may be a light source whose intensity changes according to the wavelength. That is, preferably, as shown in FIG. 4, each of the two light sources may be a light source whose intensity changes according to the wavelength. For example, one of the light sources has a wavelength whose intensity changes according to the wavelength. The other light source may be two light sources that do not have wavelength dependency such that the intensity does not change according to the wavelength, such as sunlight. In addition to direct sunlight, for example, sunlight entering through a window or a fluorescent lamp used as a general illumination means is used as a light source having no wavelength dependency. You can also Further, the number of light sources is not necessarily limited to two light sources as shown in FIG. 1, and in addition to the first light source device 2 and the second light source device 3, for example, by general illumination such as a fluorescent lamp. A configuration in which the subject 30 is irradiated with light may be used. In short, it is only necessary to realize an illumination environment in which the spectral distribution characteristics of the illumination in one direction received by the subject 30 and the illumination in the other direction are different. Can be used for the system.

  Hereinafter, an example using the first light source device 2 and the second light source device 3 having the spectral distribution characteristics as shown in FIG. .

  First, the configuration of the photographing apparatus 1 will be described. FIG. 5 is a block diagram showing a configuration of the photographing apparatus 1 according to the first embodiment of the present invention.

  As shown in FIG. 5, the photographing apparatus 1 includes an optical system 11 that transmits reflected light reflected from the face of the subject 30 by irradiation of light rays from the first light source device 2 and the second light source device 3, and an optical system. 11. A wavelength selection unit 16 that selectively transmits a light beam having a predetermined wavelength, which will be described later, from the optical image transmitted through 11, and photoelectrically converts the light beam selectively transmitted by the wavelength selection unit 16 and outputs an image signal An image output from the image capturing unit 12 such as a CCD or CMOS that performs image capturing in the image capturing unit, an image capturing control unit 13 that controls image capturing timing in the image capturing unit 12, a switching control unit 17 that performs switching control of the wavelength selecting unit 16, and the image capturing unit 12. The image processing unit 14 that performs image processing on a signal, and the storage unit 15 that serves as a registered image group storage unit that accumulates images output from the image processing unit 14 are provided.

  As the wavelength selection unit 16, a plurality of optical filters having wavelength selectivity, that is, color filters that transmit light of a specific color, and the like can be used in combination with a liquid crystal shutter or the like.

  In the photographing apparatus 1, the timing at which the photographing unit 12 photographs the subject 30 by the photographing control unit 13 and the timing at which the wavelength selection unit 16 is switched by the switching control unit 17 are synchronized.

  FIG. 6 is a diagram illustrating an example of wavelengths selected by the wavelength selection unit 16 of the imaging device 1 according to the first embodiment of the present invention.

  6 shows the spectral distribution characteristics of the first light source device 2 and the second light source device 3 and the wavelengths selected by the wavelength selection unit 16 as in FIG. The wavelength selection unit 16 does not need to selectively transmit only the light beam having the wavelength R1, for example, as shown in FIG. 6, but the transmission wavelength distribution is a wavelength distribution that transmits the light beam with the wavelength R1 as a peak, for example. It may have characteristics. In this way, the wavelength selection unit 16 transmits the light beam having the selected wavelength distribution.

  For example, the switching control unit 17 controls the wavelength selection unit 16 so as to selectively transmit the light beams having the peaks of the wavelengths R1 to R5 illustrated in FIG. Further, the imaging control unit 13 controls the imaging unit 12 such that imaging is performed after switching control is performed in synchronization with the switching control of the switching control unit 17. In this way, the imaging unit 12 sequentially performs imaging on the transmitted light that has passed through the wavelength selection unit 16 for each switching control by the switching control unit 17. That is, the photographing unit 12 in the photographing apparatus 1 performs a plurality of photographings with different wavelength distributions selected by the wavelength selecting unit 16.

  Next, the operation of the imaging system 10 configured as described above will be described.

  For example, it is assumed that the wavelength selection unit 16 selects the wavelength R1 shown in FIG. 6 under the control of the switching control unit 17. At this time, the light intensity at the wavelength R1 of the first light source device 2 is substantially zero, but the light intensity at the wavelength R1 of the second light source device 3 is maximum. Further, the wavelength selection unit 16 transmits only light having a wavelength in the vicinity of the wavelength R1. For this reason, an image of the reflected light of the subject 30 due to the irradiation of the light from the second light source device 3 is formed on the imaging surface such as a CCD provided in the photographing unit 12.

  More specifically, in the case of the spectral distribution shown in FIG. 6, the light emitted from the first light source device 2 is red light containing a green component, and the light emitted from the second light source device 3. Is blue light containing a green component. Such light components having different color components are irradiated onto the subject 30 from the respective light source devices in the configuration as shown in FIG. On the other hand, when the wavelength selection unit 16 selects the wavelength R1 shown in FIG. 6, the wavelength selection unit 16 transmits only light in the vicinity of blue. Therefore, the blue light reflected from the second light source device 3 to the subject 30 passes through the wavelength selection unit 16, but the red light reflected from the first light source device 2 to the subject 30 has the wavelength The light is attenuated by the selector 16 and most of the light cannot be transmitted. As a result, on the imaging surface of the photographing unit 12, an image by a virtual light source that virtually irradiates the subject 30 with light rays only from the second light source device 3, that is, only from the right side of the subject 30 in FIG. An image as if irradiated with light rays is formed. In this way, when the wavelength selection unit 16 selects the wavelength R1 shown in FIG. 6, a registered image such as the registered image 51 in FIG. 3 can be taken.

  Next, it is assumed that the wavelength selection unit 16 selects the wavelength R2 illustrated in FIG. 6 under the control of the switching control unit 17. At this time, the intensity at the wavelength R2 of the first light source device 2 is substantially half of the intensity at the wavelength R2 of the second light source device 3. Further, the wavelength selector 16 transmits only light rays having a wavelength in the vicinity of the wavelength R2. For this reason, in such a case, the subject 30 is virtually irradiated with light from a virtual light source located between the right second light source device 3 and the photographing device 1 toward the subject 30. Is equivalent to Therefore, when the wavelength selection unit 16 selects the wavelength R2 shown in FIG. 6, a registered image such as the registered image 52 in FIG. 3 can be taken.

  Next, it is assumed that the wavelength selection unit 16 selects the wavelength R3 illustrated in FIG. 6 under the control of the switching control unit 17. At this time, the intensity at the wavelength R3 of the second light source device 3 and the intensity at the wavelength R3 of the first light source device 2 are substantially equal. Further, the wavelength selection unit 16 transmits only light having a wavelength in the vicinity of the wavelength R3. For this reason, it is virtually equivalent to irradiating the subject 30 with light from a virtual light source located in front of the subject 30. Therefore, when the wavelength selection unit 16 selects the wavelength R3 shown in FIG. 6, a registered image such as the registered image 53 in FIG. 3 can be taken.

  Next, it is assumed that the wavelength selection unit 16 selects the wavelength R4 illustrated in FIG. 6 under the control of the switching control unit 17. At this time, the intensity at the wavelength R4 of the second light source device 3 is substantially half of the intensity at the wavelength R4 of the first light source device 2. Further, the wavelength selector 16 transmits only light rays having a wavelength near the wavelength R4. Therefore, it is virtually equivalent to irradiating the subject 30 with light from a virtual light source located between the first light source device 2 on the left and the photographing device 1 toward the subject 30. Therefore, when the wavelength selection unit 16 selects the wavelength R4 shown in FIG. 6, a registered image such as the registered image 54 in FIG. 3 can be taken.

  Furthermore, it is assumed that the wavelength selection unit 16 selects the wavelength R5 shown in FIG. 6 under the control of the switching control unit 17. At this time, the intensity of the first light source device 2 at the wavelength R5 is maximum, but the intensity of the second light source device 3 at the wavelength R5 is substantially zero. Further, the wavelength selection unit 16 transmits only light having a wavelength in the vicinity of the wavelength R5. Therefore, virtually, contrary to when the wavelength selection unit 16 selects the wavelength R1, the subject 30 is irradiated with light from the virtual light source of only the left first light source device 2 toward the subject 30. Is equivalent to Therefore, when the wavelength selection unit 16 selects the wavelength R5 shown in FIG. 6, a registered image such as the registered image 55 in FIG. 3 can be taken.

  As described above, the imaging apparatus 1 captures a plurality of subjects 30 that are irradiated by the first light source device 2 and the second light source device 3 with different wavelength distributions selected by the wavelength selection unit 16. Thus, a plurality of images of the subject 30 with different shadows are acquired.

  Thus, according to the imaging system 10, as if the illumination position was virtually changed with a simple configuration including the imaging device 1, the first light source device 2, and the second light source device 3, Images having various shades different from each other can be taken. In particular, in face recognition in which the subject's face image is used for personal authentication of the subject, it is known that the accuracy of face recognition can be improved by registering multiple images with different illumination conditions. ing. In contrast, the imaging system 10 according to the first embodiment of the present invention does not need to sequentially turn on a plurality of light sources, and can acquire a plurality of images with different illumination conditions in a short time. It is possible to eliminate the burden on the user as a subject and to easily improve the accuracy of face recognition. Furthermore, the imaging system 10 according to the first embodiment of the present invention does not require an operation to sequentially turn on a plurality of light sources, and simply the first light source device 2 and the second light source having different spectral distribution characteristics. Since it can be realized by lighting from the device 3, it can be used to create a registered image group such as a shoplifting customary person, for example, a person who is not cooperative with facial image registration, that is, a person who is not cooperative with facial image registration. be able to.

  As described above, in face recognition using a face image of a subject, the accuracy of recognizing a face can be improved by registering a plurality of images with different illumination conditions. If there is a similar face image, the processing efficiency for face recognition will decrease. For this reason, for example, as shown in a block diagram of another imaging apparatus 101 shown in FIG. 7, a configuration in which an image selection unit 18 for selecting a better image from a plurality of acquired images is further provided. it can.

  In other words, when the imaging system 10 is used for face recognition, in the imaging apparatus 101 shown in FIG. 7, the image selection unit 18 selects an image optimal for collation processing in face recognition from a plurality of images captured by the imaging unit 12. A predetermined number of images are selected and the selected image is supplied to the storage unit 15. As a reference to be selected by the image selection unit 18, for example, a reference such as the similarity of images is provided. In this case, the image selection unit 18 is configured to perform an operation of thinning out similar images, that is, selecting only images having a large difference. Further, as a method for obtaining the similarity between images, for example, it can be realized by obtaining a difference or correlation between two images. With such a configuration, the number of registered images for collation can be reduced, so that collation processing can be made more efficient. In addition, in order to efficiently extract the features of the input image, for example, a selection criterion such as the level of the high frequency component included in the image is provided, and a means for selecting an image containing more high frequency components is added. It is good also as a simple structure.

  In addition, the method of changing the position of virtual illumination by changing the arrangement and intensity of a plurality of light source devices is described in, for example, P.A. N. Belhumeur, and D.C. J. et al. Kriegman, “What is the set of images of an object under all possible lighting conditions?” Proc. IEEE Int. Conf. Computer Vision and Pattern Recognition, pp. 270-277, 1996.

  In the imaging system 10 according to the present embodiment, the example in which the distance between the first light source device 2 and the subject 30 and the distance between the second light source device 3 and the subject 30 are equal is shown. The imaging system is not limited to this example. The distance between the subject 30 and the first light source device 2 and the distance between the subject 30 and the second light source device 3 may be different.

  In the photographing system 10, the example in which the irradiation angle θ2 formed by the first light source device 2 and the irradiation angle θ1 formed by the second light source device 3 are equal is shown, but the photographing system of the present invention is an example of this. It is not limited to. The irradiation angle θ2 of the first light source device 2 and the irradiation angle θ1 of the second light source device 3 may be different.

  Furthermore, in the imaging system 10, the example in which the vertical angle formed by the first light source device 2 and the subject 30 is equal to the vertical angle formed by the second light source device 3 and the subject 30 is shown. The imaging system of the present invention is not limited to this example. The vertical angle formed by the subject 30 and the first light source device 2 and the vertical angle formed by the subject 30 and the second light source device 3 may be different. In this case, in addition to the registered image group 50 having different shadows in the horizontal direction as shown in FIG. 3, a registered image group having different shadows in the vertical direction can be taken.

  In the imaging system 10, the first light source device 2 and the second light source device 3 have been described as having a wavelength dependency, but the imaging system of the present invention is not limited to this configuration. For example, while using a light source having wavelength dependency as the first light source device 2, in principle, a light source whose intensity does not have wavelength dependency is used as the second light source device 3 as described above. It is also possible. As the second light source device 3, it is also possible to realize the configuration of the photographing system of the present invention by using natural light or illumination light such as sunlight, and using only the first light source device 2 as the light source device. is there. Accordingly, it is possible to configure an environment of the imaging system 10 in which a feeling of pressure or discomfort to the subject 30 is further suppressed or the subject 30 is not noticed.

  In addition, as described above, the photographing system 10 is not limited to two light sources as the number of light sources, and the first light source device 2 and the second light source device 3, and general illumination such as a fluorescent lamp, for example. It is also possible to adopt a configuration that combines with the environmental illumination of the above, and by combining the spectral distribution characteristics and the left and right and up and down angles and positions of such a plurality of light source devices, in the imaging system 10 according to the shadow image to be captured The lighting environment can be set flexibly.

  Since the illumination system 10 can flexibly set the illumination environment in this way, the illumination conditions for collation are limited, for example, when the shade image desired to be photographed is a shadow image only from the left side. In some cases, it is possible to set an illumination environment in which only a necessary shadow image can be obtained so that a shadow image from illumination from the right cannot be obtained.

  Further, as described above, the imaging system 10 is not limited to two light sources in terms of the number of light sources, so the first light source device 2 and the second light source device 3 have other illumination conditions other than these. Although it is good also as a light source device included, it can respond also to the case where it is not desired to consider other illumination conditions conversely. That is, as the actual illumination, the first light source device 2 and the second light source device 3 are photographed in the illumination environment of the light source device including other illumination conditions. It is also possible to make a shadow image as if it was shot in the illumination environment of the first light source device 2 and the second light source device 3. When it is not desired to consider such other illumination conditions, it is prepared by taking an image only under the other illumination conditions, and the illumination of the first light source device 2 and the second light source device 3 is prepared. In addition, an image obtained by subtracting an image based only on other illumination conditions from an image based on illumination conditions including other illumination conditions can be realized as a shadow image used for collation. When such processing is performed, other illumination conditions are applied to the illumination of the first light source device 2 and the second light source device 3 with respect to the subject 30 so that the noise of the shadow image used for collation does not become too large. Each brightness may be set in consideration of the ratio between the brightness based on the illumination conditions including the brightness and the brightness based only on the other illumination conditions.

(Second Embodiment)
Next, a photographing apparatus according to the second embodiment of the present invention will be described.

  In the first embodiment, the imaging apparatus 1 used in the imaging system has been described with a configuration example in which the switching control unit 17 performs switching control of the wavelength selection unit 16 having a plurality of color filters. The imaging system and the imaging apparatus of the present invention can also be realized by using, for example, a single-plate type color imaging device that is widely used in consumer electronic cameras. In particular, by using such a color image sensor, the photographing apparatus can be configured more simply as compared with the first embodiment. In the second embodiment of the present invention, an image capturing apparatus 100 including such a color image sensor will be described.

  The single-plate image sensor described above has a large number of photodiodes as light receiving elements arranged in a matrix and three or four color filters are arranged in a mosaic, and each photodiode is individually It is a mechanism that reacts to color components. Since the single-plate color image pickup device has such a configuration, the color image pickup device simultaneously outputs image signals for each color component of light irradiated on the image pickup surface. That is, an image signal corresponding to each of the three primary colors of light as so-called RGB signals is output from such a color image sensor.

  Thus, for example, in the photographing system as shown in FIG. 1, the light source having the spectral distribution characteristic as shown in FIG. 4 is irradiated from each light source device to the subject 30, and a single-plate type color image sensor is provided on the photographing device. By using it, a registered image can be acquired more easily.

  FIG. 8 is a block diagram showing a configuration of the photographing apparatus 100 using the color image sensor 121 in the second embodiment of the present invention. In FIG. 8, the same components as those in FIG. Further, as shown in FIG. 8, the imaging device 100 has a configuration that does not include the wavelength selection unit 16 and the switching control unit 17 in comparison with the imaging device 1 shown in FIG. 5, and the imaging unit 120 has been described above. Such a color image sensor 121 is provided. Here, an example in which the single-plate color image sensor 121 as described above is used as the color image sensor will be described.

  Hereinafter, the configuration and operation of the photographing apparatus 100 will be described by taking an example in which the photographing apparatus 100 is used instead of the photographing apparatus 1 in the photographing system as shown in FIG.

  First, in the photographing apparatus 100 shown in FIG. 8, reflected light reflected from the face of the subject 30 is incident on the optical system 11 by irradiation of light rays from the first light source device 2 and the second light source device 3. . The light image transmitted through the optical system 11 is projected onto the color imaging device 121 of the photographing unit 120, and an image that is the face of the subject 30 is formed on the imaging surface of the color imaging device 121. The color image sensor 121 is an image sensor in which three to four types of color filters as described above are arranged in a mosaic pattern for each light receiving element, and each light receiving element reacts to an individual color component. Here, an example in which red (R), green (G), and blue (B) color filters are arranged in a mosaic pattern in the color image sensor 121 will be described.

  Since the color imaging device 121 has such a configuration, the intensity of light is detected for each of the red, green, and blue color components in the image formed on the imaging surface. As shown in FIG. 8, an image signal which is an R signal corresponding to red, a G signal corresponding to green, and a B signal corresponding to blue is output. These image signals are processed by the image processing unit 14, and RGB images output from the image processing unit 14 are accumulated in the storage unit 15 as a registered image group storage unit.

  In such an imaging system using the imaging device 100, when the subject 30 is irradiated with light rays having the spectral distribution characteristics as shown in FIG. 4 from the first light source device 2 and the second light source device 3, the following is performed. Thus, an image for the registered image group can be acquired. That is, a red light beam including a green component irradiated from the first light source device 2 and a blue light beam including a green component irradiated from the second light source device 3 are configured as shown in FIG. The object 30 is irradiated from the light source device. The light beam applied to the subject 30 reflects the subject 30, and the reflected light is projected onto the imaging surface of the color imaging element 121. At this time, for example, red light from the first light source device 2 does not enter each light receiving element in which the blue color filter of the color image sensor 121 is disposed, and the light from the second light source device 3 does not enter. Only blue light is incident. For this reason, from the B signal output of the color image sensor 121, an image signal of an image in which a light beam is irradiated only from the right side on the subject 30 in FIG. Conversely, the blue light from the second light source device 3 does not enter each light receiving element in which the red color filter of the color image sensor 121 is disposed, and the light from the first light source device 2 does not enter. Only red light is incident. For this reason, from the R signal output of the color image sensor 121, an image signal of an image in which a light beam is irradiated only from the left side on the subject 30 in FIG. Further, each light receiving element in which the green color filter of the color image sensor 121 is arranged has a light beam of a green component from the first light source device 2 and a light beam of a green component from the second light source device 3. Incident light. For this reason, from the G signal output of the color image sensor 121, an image signal of an image as if the subject 30 in FIG. In this way, a registered image 55 in FIG. 3 can be acquired from the R signal output, a registered image 53 from the G signal output, and a registered image 51 such as the registered image 51 from the B signal output.

  As described above, according to the photographing apparatus 100 in the second embodiment of the present invention, the number of registered images is limited to, for example, three types of shaded images corresponding to RGB. Therefore, it is possible to acquire a plurality of shadow images in a very short time so that a person who takes a picture receives an impression of a moment. Therefore, according to the photographing system using the photographing apparatus 100, images having various shades different from each other with a simple configuration including the photographing apparatus 1, the first light source apparatus 2, and the second light source apparatus 3 can be saved. You can shoot quickly without applying.

  In particular, as described above, the accuracy of recognizing a face can be improved by increasing the number of registered images with different illumination conditions used for face recognition. As a minimum, three images are required. On the other hand, the imaging apparatus 100 according to the second embodiment can acquire shadow images under three different types of virtual illumination conditions by one imaging, and thus the imaging apparatus 100 according to the second embodiment of the present invention. According to this, it is possible to easily create a registered image group necessary for maintaining the accuracy of face recognition.

  Note that, for example, the number of types of color filters in the color imaging device is further increased, or the switching control unit 17 and the wavelength selection unit 16 of the imaging device 1 in the first embodiment and the color filter of the color imaging device are added. A structure such as a combined double structure may be used, and by using such a structure, the number of different shadow images can be further increased.

(Third embodiment)
Next, the collation apparatus 60 in the 3rd Embodiment of this invention is demonstrated. A collation device 60 according to the third embodiment of the present invention includes the imaging device 1 described in the first embodiment of the present invention, and a registered image group 50 stored in the storage unit 15 of the imaging device 1. And the input image to be input can be compared and collated. Note that, instead of the image capturing device 1, the image capturing device 101 in the first embodiment or the image capturing device 100 in the second embodiment may be used. FIG. 9 is a block diagram showing a configuration of the collation device 60 according to the third embodiment of the present invention.

  The collation device 60 according to the third embodiment of the present invention includes the imaging device 1 described in the first embodiment of the present invention, an input unit 61 to which an input image to be compared and collated is input, and registration of the imaging device 1. A collation unit 62 for comparing and collating a registered image group 50 corresponding to each person registered in advance and stored in the storage unit 15 as an image group storage unit with an input image input from the input unit 61; An output unit 63 for outputting the result of comparison and collation in the unit 62 is provided.

  As the input unit 61 of the collation device 60 in the third embodiment of the present invention, various known camera devices can be used to input a live image, and when inputting a photograph or the like, A scanner device can be used, and furthermore, a reading means for reading data from a storage medium in which a face image of a person to be collated is stored can be used.

  Further, the present invention is not limited to the face image comparison / collation method in the collation unit 62. For example, a known image comparison / collation method such as eigenspace method, subspace method, or KNN method may be used. Is possible.

  As the output unit 63 of the collation device 60 in the third embodiment of the present invention, an output unit that outputs the collation result to an external device can be used, or the collation result is output to the person to be collated. It is also possible to use a display device for this purpose.

  Here, the operation of the collation device 60 in the third embodiment of the present invention will be described. FIG. 10 is a flowchart for explaining the operation steps of collation apparatus 60 in the third embodiment of the present invention.

  As shown in FIG. 10, in the collation device 60 according to the third embodiment of the present invention, first, an image for comparison is input from the input unit 61 (S1).

  Next, the comparison image input from the input unit 61 is compared with the registered image group 50 stored in advance in the storage unit 15 of the photographing apparatus 1 (S2). In this step S2, the registered image group 50 having different shadows photographed by the photographing system 10 in the first embodiment of the present invention is stored as a registered image group 50 for each person registered in advance. Therefore, even if the comparison image input from the input unit 61 has any shadow, it is possible to perform a verification process with a relatively high personal authentication rate.

  Furthermore, the collation device 60 according to the third embodiment of the present invention outputs the collation result in the collation unit 62 from the output unit 63, and ends the process (S3).

  As described above, by configuring the collation device 60 according to the third embodiment of the present invention, each of the pre-registered persons photographed by the photographing device 1 is stored in the storage unit 15 of the collation device 60. Since the registered image group 50 having various shadows is registered, the user authentication is performed without being adversely affected by the shadow caused by the light source when the input image input from the input unit 61 is captured. Can do.

(Fourth embodiment)
Next, a collation device 69 according to the fourth embodiment of the present invention will be described.

  In 1st Embodiment, although the example which used the imaging | photography system 10 for imaging | photography of the registration image group 50 in a face recognition apparatus was shown and demonstrated, the use of the imaging | photography system 10 is not limited to this, For example, the collation apparatus as shown in the third embodiment can be used to capture an image input during collation. That is, when the imaging system 10 of the first embodiment is used for such a purpose, it is possible to capture a plurality of input images having different shadows as in the registered image group 50. As described above, the collation device 69 according to the fourth embodiment of the present invention acquires an input image for comparison with the registered image group 50 in the same form as the imaging system 10 according to the first embodiment. It is characterized by being configured. Accordingly, the collation device 69 can also implement a collation method using a plurality of input images, for example, instead of using one input image in the collation processing.

  FIG. 11 is a block diagram showing a configuration of a collation device 69 according to the fourth embodiment of the present invention. In FIG. 11, the same components as those in FIGS. 1, 5, and 7 are denoted by the same reference numerals.

  As shown in FIG. 11, the collation device 69 according to the fourth embodiment of the present invention is arranged so as to face the subject 30 as a person, like the photographing system 10 according to the first embodiment. The first light source device 2 that irradiates the face of the subject 30 from the left direction toward the subject 30 when viewed from the photographing device 1 and the photographing device 1 and the right direction toward the subject 30 when viewed from the photographing device 1. A second light source device 3 that irradiates the face of the subject 30 is provided. Note that, instead of the imaging device 1, the imaging device 101 in the first embodiment or the imaging device 100 in the second embodiment may be used. In addition, the photographing apparatus 1, the photographing apparatus 101, or the photographing apparatus 100 may be configured not to include the storage unit 15. In the fourth embodiment, as illustrated in FIG. A description will be given using a configuration in which the collation device 69 includes the storage unit 15 instead of the imaging device 1.

  Further, the collation device 69 is an input unit 61 to which a plurality of input images to be compared and collated are input from the imaging device 1, and an image selection that selects an image based on a predetermined criterion from the plurality of input images input to the input unit 61 64, a collation unit 62 for comparing and collating the registered image group 50 corresponding to each person registered in advance and stored in the storage unit 15 as a registered image group storage unit and the input image supplied from the image selection unit 64. , And an output unit 63 for outputting the result of the comparison and collation in the collation unit 62.

  Next, the operation of the verification device 69 configured as described above will be described.

  First, the first light source device 2 and the second light source device 3 irradiate the subject 30 with a light beam having a spectral distribution characteristic as shown in FIG. Therefore, by combining the first light source device 2 and the second light source device 3 with the imaging device 1 having the wavelength selection unit 16 that selectively transmits a light beam having a specific wavelength, as described above. This is equivalent to that the subject 30 is photographed by virtual illumination, whereby a plurality of images having different shadows are obtained. That is, the image capturing apparatus 1 outputs image signals as an input image group of such a plurality of images, and these image signals are supplied to the input unit 61.

  In addition, the image selection unit 64 selects only one or a plurality of images optimal for collation from the input image group captured in this way, and supplies the selected images to the collation unit 62. As a reference selected by the image selection unit 64, for example, a reference such as an image similarity is provided. In this case, the image selection unit 64 is configured to perform an operation of thinning out similar images, that is, selecting only images with large differences. Further, as a technique for obtaining the similarity between images, for example, it can be realized by using a difference calculation between two images. By adopting such a configuration, the number of input images for collation can be reduced, so that collation processing can be made more efficient. In addition, in order to efficiently extract the features of the input image, for example, a selection criterion such as the level of the high-frequency component included in the image is provided, and a means for selecting an image containing more high-frequency components is added. It is good also as a simple structure. In particular, when the person is non-cooperating in the face recognition, there are many cases where it is not always possible to acquire an optimal input image. However, a plurality of images can be acquired in a short time, and such an image selection unit 64 can be obtained. By providing, an optimal image can be extracted from an input image group including images that are not suitable for collation, so that the accuracy of face recognition can be improved and the accuracy can be improved. The image selected by the image selection unit 64 is supplied to the collation unit 62 as a comparison image.

  Next, the collation unit 62 compares and collates the comparison image supplied from the image selection unit 64 with the registered image group 50 stored in the storage unit 15 in advance. At this time, a registered image group 50 having different shades is stored in the storage unit 15 for each person registered in advance. Further, the collation result in the collation unit 62 is output from the output unit 63.

  As described above, the collation device 69 selects an image suitable for face recognition by the image selection unit 64 from a plurality of images acquired by the photographing device 1 and also has images having different shadows stored as the registered image group 50. Since face matching is performed using this, it is possible to realize a matching process with an increased authentication rate.

  In the above description, an example in which a registered image having a plurality of shadows is prepared as a registered image group of registered persons has been described. For example, a person 1 registered as a registered image group 1 Only one registered image is prepared for a person, and the collation unit 62 uses a plurality of images captured from the image capturing apparatus 1 as input images or a plurality of comparison images and registered images selected by the image selection unit 64. It may be configured to compare and collate with.

  FIG. 12 is a diagram illustrating an example using a collation device 69 according to the fourth embodiment of the present invention.

  In FIG. 12, a registered image group of non-cooperating persons is registered in the face image registration, face recognition of an unspecified number of persons is performed, and a registered person is found from the unspecified number of persons. An example is shown in which the collation device 69 in the fourth embodiment of the present invention is used in the system. More specifically, it is assumed that the person who is uncooperating in the registration of the face image, for example, a person like a shoplifting addiction, registers a group of suspicious persons in advance, and includes an unspecified number of general customers This is a system that checks the face of a person who is present and alerts a store clerk when a person registered by the face check is found.

  In FIG. 12, a store 70 is provided with a plurality of shelves 72 displaying products sold at the store 70. In such a store 70, there is a possibility that a general visitor who purchases a product also includes an unauthorized person called shoplifting who steals the product. For this reason, FIG. 12 shows an example in which a collation device 69 is installed in the store 70 and the collation device 69 is used to find an unauthorized person such as a shoplifting regular offender from a customer.

  In order to prevent such fraud such as shoplifting, in the store 70 in FIG. 12, the first light source device 2 and the second light source device 3 of the verification device 69 are installed on the wall 71 of the store 70. Further, in order to prevent unauthorized persons from noticing the installation of the collation device 69, in FIG. 12, as the first light source device 2 and the second light source device 3, like a plate-like display installed on the wall 71. An example of a simple light source is shown. The first light source device 2 and the second light source device 3 have spectral distribution characteristics as shown in FIG. 4, for example. Here, the wall 71 is in the form of display illumination with different emission colors. Is installed. In addition, characters such as a guide for the store 70 may be written on the display that is the first light source device 2 and the second light source device 3. Further, as described in the first embodiment, any one of the first light source device 2 and the second light source device 3 is sunlight or illumination light, or the first light source device 2 and the second light source device 3 are used. The illumination environment may be set such that a necessary shadow image can be obtained by combining the second light source device 3 and environmental illumination such as general illumination such as a fluorescent lamp.

  Furthermore, the imaging device 1 is disposed between the first light source device 2 and the second light source device 3. For example, the main body of the verification device 69 is disposed on the back side of the wall 71. Note that, instead of the imaging device 1, the imaging device 101 in the first embodiment or the imaging device 100 in the second embodiment may be used. Further, the collating device 69 does not have to be integrated with each other, and as shown in FIG. 12, the first light source device 2, the second light source device 3, and the photographing device 1 are attached to the wall 71, A configuration in which an image signal is supplied to the main body of the verification device 69 by a connection cable or the like extended from the imaging device 1 may be used. Further, in order to prevent unauthorized persons from noticing the existence of the photographing apparatus 1, a hole that allows light to pass through may be provided in the wall 71, and the photographing apparatus 1 may photograph through the hole.

  FIG. 12 shows an example in which a control device 73 for remotely operating the collation device 69 is provided in the vicinity of a store clerk. Accordingly, when a store clerk or the like operates the control device 73, a control signal is notified to the verification device 69 or a verification result from the output unit 63 is notified to the control device 73 according to the operation. The

  In FIG. 12, the collation device 69 is configured such that the photographing device 1 includes the storage unit 15. Accordingly, when a store clerk or the like uses the control device 73 to instruct the photographing apparatus 1 to acquire an image for the registered image group, an image for the registered image group is acquired. For example, the first embodiment A registered image group is created and stored in the storage unit 15 in the same manner as the form. Further, when a store clerk or the like uses the control device 73 to instruct to perform collation, an input image for comparison and collation is acquired, and for example, collation processing described with reference to FIG. 10 is performed.

  In the store 70 shown in FIG. 12, since the collation device 69 is used in the above-described usage pattern, for example, when a person who appears to be suspicious appears in the store 70, the person is in charge of the first light source device 2 and When approaching the vicinity of the second light source device 3, a store clerk or the like operates the control device 73 to create a registered image group of the person. In particular, since the first light source device 2 and the second light source device 3 are simply configured as display lighting with different emission colors, the person can be aware of a registered image group of a suspicious person. Can be created without. In this way, using the collation device 69, for example, a registered image group that makes a suspicious person list can be created.

  On the other hand, for example, when a person approaches the vicinity where the photographing apparatus 1 is installed, the photographing apparatus 1 photographs the person, and the collation processing by the collation apparatus 69 automatically operates. For example, such an automatic operation can be realized by using a sensor that senses the approach of a person and configuring the collation device 69 to operate when the sensor senses a person. The collation device 69 is configured in this way. For example, when the collation result of the collation device 69 matches the person who performed the collation processing with the person registered in the registered image group, the collation device 69 sends a control device 73 to the control device 73. , Notify the information that the registrant is detected.

  In the store 70 as shown in FIG. 12, when the person who seems to be suspicious and registered in advance as a registered image group appears again in the store 70 by the operation of the verification device 69 as described above. The collation function of the collation device 69 as described above can notify a store clerk or the like of information that the registered person who seems to be suspicious appears again. As a result, the store clerk and the like can pay attention to those who seem to be suspicious and can help prevent theft such as shoplifting.

  In general, for the purpose of monitoring an unauthorized person such as shoplifting, for example, in a store 70 such as a bookstore, a security camera is installed to prevent theft by an unauthorized person. As described above, by using the collation device 69 according to the fourth embodiment of the present invention, for example, when an unauthorized person appears without checking each person in the image recorded by the security camera, Information to this effect can be notified. For this reason, the effect which prevents fraud like shoplifting in the store 70 as shown in FIG. 12 can be heightened more. In particular, the collation device 69 according to the fourth embodiment of the present invention is configured not to be noticed by an unauthorized person, and acquires a plurality of registered image groups and input image groups having different shades in a short time. Therefore, for example, the above-described improvement in accuracy and short-term discovery of unauthorized persons as described above can be realized, and it can be used for preventing fraud more effectively.

  In the above, an example has been described in which the collation device 69 according to the fourth embodiment of the present invention is used for preventing fraud. However, the present invention is not limited to such use. By using it in a traffic control system that controls traffic, it is possible to realize a collation device that further suppresses the feeling of pressure and discomfort for the user who is the subject.

  As described above, according to the present invention, it has an excellent effect that a registered image group can be taken naturally without giving a feeling of pressure to the subject with a simple device configuration. It is useful as a collation device that performs personal authentication of a subject using the face image of the subject, and more specifically, as a photographing system, a photographing device, a collation device using the photographing device, and a photographing method for photographing a registered image group of the collating device.

The top view which shows schematic structure of the imaging | photography system in the 1st Embodiment of this invention 1 is a side view showing a schematic configuration of a photographing system according to a first embodiment of the present invention. The figure which shows an example of the registration image group in the 1st Embodiment of this invention The figure which shows the spectral distribution characteristic of each of the 1st light source device of the imaging | photography system in the 1st Embodiment of this invention, and a 2nd light source device. 1 is a block diagram illustrating a configuration of a photographing apparatus according to a first embodiment of the present invention. The figure which shows an example of the wavelength which the wavelength selection part of the imaging device in the 1st Embodiment of this invention selects. The block diagram which shows the other structural example of the imaging device in the 1st Embodiment of this invention. The block diagram which shows the structure of the imaging device in the 2nd Embodiment of this invention. The block diagram which shows the structure of the collation apparatus in the 3rd Embodiment of this invention. The flowchart for demonstrating the operation | movement step of the collation apparatus in the 3rd Embodiment of this invention. The block diagram which shows the structure of the collation apparatus in the 4th Embodiment of this invention. The figure which shows an example using the collation apparatus in the 4th Embodiment of this invention

Explanation of symbols

1, 100, 101 Imaging device 2 First light source device 3 Second light source device 10 Imaging system 11 Optical system 12, 120 Imaging unit 13 Imaging control unit 14 Image processing unit 15 Storage unit 16 Wavelength selection unit 17 Switch control unit 18 , 64 Image selection unit 30 Subject 50 Registered image group 51-55 Registered image 60, 69 Verification device 61 Input unit 62 Verification unit 63 Output unit 70 Store 71 Wall 72 Shelf 73 Control device 121 Color imaging device

Claims (13)

A first light source device that irradiates a subject with a light beam having a first spectral distribution;
A second light source device that irradiates the subject with a light beam having a second spectral distribution different from the first spectral distribution;
A wavelength distribution unit that transmits a light beam having a selected wavelength distribution, and the wavelength selection unit selects the object irradiated by the first light source device and the second light source device by the wavelength selection unit; An imaging system comprising: an imaging device for acquiring a plurality of images having different shadows from each other by imaging a plurality of different subjects. The imaging system according to claim 1, wherein the wavelength selection unit includes a plurality of optical filters. The imaging system according to claim 2, wherein the wavelength selection unit includes a switching control unit that performs switching control of the plurality of optical filters. 4. The device according to claim 1, wherein the second light source device irradiates the subject from a direction different from a direction in which the first light source device emits light to the subject. The imaging system according to claim 1. 5. The imaging apparatus according to claim 1, wherein the imaging apparatus includes an imaging control unit that controls imaging timing so as to acquire an image according to selection of a wavelength distribution by the wavelength selection unit. The imaging system according to claim 1. The imaging system according to claim 5, wherein the imaging control unit controls imaging timing of the imaging apparatus based on a control signal from the switching control unit. The imaging system according to claim 1, wherein the imaging device includes a storage unit that stores a captured image. A first light source device that includes a wavelength selection unit that transmits light of the selected wavelength distribution and that irradiates the subject with light having the first spectral distribution; and a second spectrum different from the first spectral distribution The subject in a state of being irradiated by a second light source device that irradiates the subject with a light beam having a distribution,
An imaging apparatus comprising: an imaging unit that acquires a plurality of images with different shadows of the subject by imaging a plurality of different wavelength distributions selected by the wavelength selection unit. The imaging device further includes:
An image selection unit that selects an image according to a predetermined reference from a plurality of images of the photographed subject having different shadows;
The photographing apparatus according to claim 8, further comprising a storage unit that stores the selected image. The imaging unit includes a color imaging device having a color filter corresponding to a plurality of types of colors as the wavelength selection unit and a plurality of light receiving elements, and performs imaging for each color type of the color filter. The imaging device according to claim 8 or 9. An imaging device according to claim 8;
A storage unit that stores, as a registered image group, a plurality of images having different shadows of the subject imaged by the imaging device;
An input unit for inputting an image to be verified;
A collation apparatus comprising: a collation unit that compares and collates the image to be collated input from the input unit and the registered image group stored in the storage unit. An imaging device according to claim 8;
A storage unit that stores a plurality of images of the subject with different shadows as a registered image group;
An input unit to which an image to be collated photographed by the photographing device is input;
A collation apparatus comprising: a collation unit that compares and collates the image to be collated input from the input unit and the registered image group stored in the storage unit. A first light source device that irradiates a subject with a light beam having a first spectral distribution; a second light source device that irradiates the subject with a light beam having a second spectral distribution different from the first spectral distribution; A method for photographing a subject using a photographing system including a photographing device,
The imaging device captures a plurality of images of the subject that are irradiated by the first light source device and the second light source device with different wavelength distributions, whereby a plurality of images of the subject having different shadows are captured. A method for photographing a subject, comprising: a step of photographing.

Images